Session Level Reporting Due to the GTP-u Error Indication Call Flow

When the UPF receives the GTP-u Error Indication from gNB, it detects the PFCP session and sends the PFCP Session Report request to the SMF handling that session along with the Error Indication Report IE. The Error Indication IE also includes the remote F-TEID IE, which contains the GTP-u peer address and the TEID received from the GTP-u Error Indication IE.

StepDescription
1A PFCP session is established and the data traffic starts running.
2When gNB clears up the TEID details locally for some reason, it sends the GTP-u Error Indication to UPF for unknown TEID.
3Once the Error Indication is received, the UPF identifies the PFCP session and sends the PFCP session report request to the SMF.
4The session report request contains the TEID and the remote IP address from where the Error Indication is received.